APA (7th ed.) Citation

Sivak Jr., M. J., Barkin, J. S., & Guttman, E. Hemorragia gastrointestinal oculta.

Chicago Style (17th ed.) Citation

Sivak Jr., Michael Jr, Jamie S. Barkin, and Elias Guttman. Hemorragia Gastrointestinal Oculta.

MLA (8th ed.) Citation

Sivak Jr., Michael Jr, et al. Hemorragia Gastrointestinal Oculta.